I don't know WHY one machine is noisier than any other, but I too, have the same problem. I'm in a sewing guild with 18 other women, and MY machine is noisy, while the other ladies machines seem to prrr like kitties. I, too, have oiled my moving parts in my machine. My machine is a Necchi, not an Elna, but this is certainly an aggravating thing. I'll follow along with this thread, and hopefully you and I will both be given ideas on what is causing this. Thanks for posting.